.c1{
    width: 444px;
    height: 350px;
    background-color: red;
    margin: auto;
    position: relative;
}
.c1 img{
    width: 100%;
    height: 100%;
}
.c1 .c2{
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3) url(../img/arr.png) no-repeat center;
    position: absolute;
    top: 0;
    left: 0;
    display: none;
}
.c1:hover .c2{
    display: block;
}